My American English is superb, as shown by my US exam score: 98% at the highest level of difficulty. On the other hand, my British English is adequate, but I'm sure I couldn't "pass" as a native.
Relevant Skills and Experience
My clients rehire me regularly and have awarded me 19 bonuses for the quality of my work, nearly one in six projects.
Proposed Milestones
$50 USD - Improve client's English
My bid is flexible, as you haven't provided enough details in your project description.